A boil is a localized deep skin infection. It is a bacterial infection with pus that develops around the hair follicle. Boils are contagious and it can become serious if it spreads. Boil starts or appears suddenly and are usually very painful. The surrounding skin may become swollen and red within 24 hours.
Boils normally clears in about two weeks time.
There are many types of boils but they are broadly classified under four major types. They are:
a) Furuncle or carbuncle:
This is caused by Staphylococcus aureus bacteria.
They may be accompanied by fever or chill . The boil may have one or more openings. Carbuncle is a cluster of boils. These boils cause a deeper and more severe infection than a single boil. Older men are generally affected by this type of boils.
b) Cystic acne :
They occur when oil ducts are clogged and infected. This affects deeper tissues and usually appears on the face.
c) Pilondial cyst:
It usually occurs on the crease of the buttocks. It appears as small or tiny infection at the hair follicle. After some time it gets inflamed and causes discomfort on sitting. Normally it occurs after a long journey.
This type of boil usually occurs in the arm pit and groin area. They appear in group . it is due to the inflammation of the local sweat gland. They can be generally treated by surgery only and not through antibiotics.